package com.rio.core;

import java.io.File;



import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.util.Log;

/**
 * A helper class to manage database creation and version management.
 * You create a subclass implementing {@link #onCreate}, {@link #onUpgrade} and
 * optionally {@link #onOpen}, and this class takes care of opening the database
 * if it exists, creating it if it does not, and upgrading it as necessary.
 * Transactions are used to make sure the database is always in a sensible state.
 * <p>For an example, see the NotePadProvider class in the NotePad sample application,
 * in the <em>samples/</em> directory of the SDK.</p>
 */
public abstract class BaseSQLiteOpenHelper {
    //private static final String TAG = BaseSQLiteOpenHelper.class.getSimpleName();

    private Context mContext;
    private final String mName;
    private final CursorFactory mFactory;
    private final int mNewVersion;

    private SQLiteDatabase mDatabase = null;
    private boolean mIsInitializing = false;
	private String mPath;

    /**
     * Create a helper object to create, open, and/or manage a database.
     * The database is not actually created or opened until one of
     * {@link #getWritableDatabase} or {@link #getReadableDatabase} is called.
     *
     * @param context to use to open or create the database
     * @param name of the database file, or null for an in-memory database
     * @param factory to use for creating cursor objects, or null for the default
     * @param version number of the database (starting at 1); if the database is older,
     *     {@link #onUpgrade} will be used to upgrade the database
     */
    public BaseSQLiteOpenHelper(Context context, String name, CursorFactory factory, int version) {
        if (version < 1) throw new IllegalArgumentException("Version must be >= 1, was " + version);
        mContext = context;
        mName = name;
        mFactory = factory;
        mNewVersion = version;
    }
    
    /**
     * @param path
     * @param name
     * @param factory
     * @param version
     */
    public BaseSQLiteOpenHelper(String path, String name, CursorFactory factory, int version) {
        if (version < 1) throw new IllegalArgumentException("Version must be >= 1, was " + version);
        mPath = path;
        mName = name;
        mFactory = factory;
        mNewVersion = version;
    }

    /**
     * Create and/or open a database that will be used for reading and writing.
     * Once opened successfully, the database is cached, so you can call this
     * method every time you need to write to the database.  Make sure to call
     * {@link #close} when you no longer need it.
     *
     * <p>Errors such as bad permissions or a full disk may cause this operation
     * to fail, but future attempts may succeed if the problem is fixed.</p>
     *
     * @throws SQLiteException if the database cannot be opened for writing
     * @return a read/write database object valid until {@link #close} is called
     */
    public synchronized SQLiteDatabase getWritableDatabase() {
        if (mDatabase != null && mDatabase.isOpen() && !mDatabase.isReadOnly()) {
            return mDatabase;  // The database is already open for business
        }

        if (mIsInitializing) {
            throw new IllegalStateException("getWritableDatabase called recursively");
        }

        // If we have a read-only database open, someone could be using it
        // (though they shouldn't), which would cause a lock to be held on
        // the file, and our attempts to open the database read-write would
        // fail waiting for the file lock.  To prevent that, we acquire the
        // lock on the read-only database, which shuts out other users.
        
        boolean success = false;
        SQLiteDatabase db = null;
        //if (mDatabase != null) mDatabase.lock();
        try {
            mIsInitializing = true;
            if(mPath != null){
            	if(!U.isSDCardAvaiable())throw new IllegalArgumentException(" the external storage is not available");	
            	db = SQLiteDatabase.openOrCreateDatabase(mPath, mFactory);
            }else if (mName != null && mContext != null) {
            	db = mContext.openOrCreateDatabase(mName, 0, mFactory);
            } else {  
                db = SQLiteDatabase.create(null);
            }
            db.setLockingEnabled(true);
            int version = db.getVersion();
            if (version != mNewVersion) {
                db.beginTransaction();
                try {
                    if (version == 0) {
                        onCreate(db);
                    } else {
                        onUpgrade(db, version, mNewVersion);
                    }
                    db.setVersion(mNewVersion);
                    db.setTransactionSuccessful();
                } finally {
                    db.endTransaction();
                }
            }

            onOpen(db);
            success = true;
            return db;
        } finally {
            mIsInitializing = false;
            if (success) {
                if (mDatabase != null) {
                    try { mDatabase.close(); } catch (Exception e) { }
                    //mDatabase.unlock();
                }              
                mDatabase = db;
            } else {
               // if (mDatabase != null) mDatabase.unlock();
                if (db != null) db.close();
            }
        }
    }


    /**
     * Close any open database object.
     */
    public synchronized void close() {
        if (mIsInitializing) throw new IllegalStateException("Closed during initialization");

        if (mDatabase != null && mDatabase.isOpen()) {
            mDatabase.close();
            mDatabase = null;
        }
    }

    /**
     * Called when the database is created for the first time. This is where the
     * creation of tables and the initial population of the tables should happen.
     *
     * @param db The database.
     */
    public abstract void onCreate(SQLiteDatabase db);

    /**
     * Called when the database needs to be upgraded. The implementation
     * should use this method to drop tables, add tables, or do anything else it
     * needs to upgrade to the new schema version.
     *
     * <p>The SQLite ALTER TABLE documentation can be found
     * <a href="http://sqlite.org/lang_altertable.html">here</a>. If you add new columns
     * you can use ALTER TABLE to insert them into a live table. If you rename or remove columns
     * you can use ALTER TABLE to rename the old table, then create the new table and then
     * populate the new table with the contents of the old table.
     *
     * @param db The database.
     * @param oldVersion The old database version.
     * @param newVersion The new database version.
     */
    public abstract void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion);

    /**
     * Called when the database has been opened.
     * Override method should check {@link SQLiteDatabase#isReadOnly} before
     * updating the database.
     *
     * @param db The database.
     */
    public void onOpen(SQLiteDatabase db) {}
}

